Frequencies for first 10,000 rows of birwt4 variable in natl2002 dataset :

      Birth |
     Weight |
   Recode 4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         91        0.91        0.91
          2 |        485        4.85        5.76
          3 |      9,397       93.97       99.73
          4 |         27        0.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015